This LED light string uses only 4.8 watts of electricity. Each string has 70 lights spaced 4" apart, and string may be plugged into each other from end to end, with up to 20 strings together on one plug. The string is suitable for use in both indoor and outdoor applications and can last up to 50,000 hours. Use energy efficient LED light strings seasonally, or year-round, for pleasing ambient light in backyards, decks and patios. The bulb colors are multi-color.